Before you post, please read Effective Posting. In particular, please read the FDS User Guide. It is a searchable PDF document with an organized table of contents that can answer many frequently asked questions.
The FDS and Smokeview homepage is https://pages.nist.gov/fds-
For bug reports or feature requests go to https://github.com/firemode
To post to the forum you will need to have an account with Google. To setup an account click here. You can use any email address for a Google account.
Use the file extension ".txt" when attaching input files.
If you are directed to try a "test" version of FDS, you can find it here.